EP3078950A1 - Procédé de mesure de la couleur et colorimètre - Google Patents

Procédé de mesure de la couleur et colorimètre Download PDF

Info

Publication number
EP3078950A1
EP3078950A1 EP15162791.6A EP15162791A EP3078950A1 EP 3078950 A1 EP3078950 A1 EP 3078950A1 EP 15162791 A EP15162791 A EP 15162791A EP 3078950 A1 EP3078950 A1 EP 3078950A1
Authority
EP
European Patent Office
Prior art keywords
illumination
real
reflection factors
nominal
measured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15162791.6A
Other languages
German (de)
English (en)
Other versions
EP3078950B1 (fr
Inventor
Peter Ehbets
Matthias Scheller Lichtenauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
X Rite Switzerland GmbH
Original Assignee
X Rite Switzerland GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by X Rite Switzerland GmbH filed Critical X Rite Switzerland GmbH
Priority to EP15162791.6A priority Critical patent/EP3078950B1/fr
Priority to US15/094,779 priority patent/US10260943B2/en
Publication of EP3078950A1 publication Critical patent/EP3078950A1/fr
Priority to US16/291,691 priority patent/US10724901B2/en
Application granted granted Critical
Publication of EP3078950B1 publication Critical patent/EP3078950B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0297—Constructional arrangements for removing other types of optical noise or for performing calibration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/504—Goniometric colour measurements, for example measurements of metallic or flake based paints
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G01J3/524—Calibration of colorimeters

Definitions

  • the invention relates to a color measuring method according to the preamble of independent claim 1 and to a color measuring device according to the preamble of independent claim 11.
  • Color measurement devices of the type in question can be designed independently of the underlying measurement technology as autonomous devices or as measurement peripherals for use in conjunction with a computer that controls and evaluates measurement data.
  • Autonomous color measuring instruments contain all operating and display devices required for measuring operation as well as their own power supply and, moreover, in many cases are also equipped with an interface for communication with a computer, whereby both measured data and control data can be exchanged with the computer.
  • As measuring peripherals designed colorimeters usually have no own operating and display organs and are - like any other computer peripheral device - controlled by the parent computer.
  • USB interface Universal Serial Bus
  • the present invention primarily deals with the avoidance or compensation or correction of measurement errors caused by such angular errors.
  • the present invention is intended to improve a color measuring method and a corresponding color measuring device of the respective generic type such that measured value distortions caused by angular errors of the different measuring channels (illumination and observation directions) can be corrected in a relatively simple manner and without additional complexity of the color measuring device, so that the The nominal illumination and observation directions specified by the respective measurement geometry are precisely adhered to, and thus measured value falsifications are avoided.
  • Another goal is to improve the conformity of the measured values between different color measuring devices of the same construction.
  • the essence of the invention consists in the following:
  • a measurement spot of a measurement object is exposed to illumination light under at least one real illumination direction of the color measurement device by means of a color measurement device and preferably spectral reflection factors of the measurement light reflected back from the measurement spot under at least one real observation direction of the color measurement device measured.
  • the measured reflection factors are corrected with regard to deviations in the actual illumination and observation directions of the colorimeter from measured value distortions caused by nominal illumination and observation directions given by the measurement geometry of the colorimeter.
  • a continuous correction model is formed which represents the relationship between the measured intensity of the measurement light reflected back from the measurement spot and changes in the difference between the illumination and observation directions.
  • the measured reflection factors are corrected on the basis of this correction model taking into account the real and nominal illumination and observation directions of the colorimeter.
  • the calculation and application of a correction model according to the invention permits a relatively simple correction of the measured value distortions caused by angular errors without structural alteration of the color measuring instrument used.
  • the correction model can be used uniformly for all measurement geometries.
  • a real brightness reflection factor is calculated for each paired combination of illumination and observation directions from the measured reflection factors, and these real brightness reflection factors are calculated from the correction model and the real and nominal illumination and observation directions of the colorimeter each calculates a nominal brightness reflection factor.
  • the measured reflection factors are then corrected on the basis of the real brightness reflection factors and the nominal brightness reflection factors.
  • the real and the nominal illumination and observation directions of the colorimeter are transformed into flake normal angles and the correction model and the nominal brightness reflection factors (R ( ⁇ ni )) are calculated in the space of the flake normal angles.
  • the nominal brightness reflection factors are calculated from the respective residual between the real brightness reflection factors and the correction model.
  • the measured reflection factors are calculated on the basis of the difference between the real brightness reflection factors and the nominal brightness reflection factors.
  • the measurement spot of the measurement object is advantageously exposed to illumination light under at least three, preferably at least five different, real illumination directions. Likewise, it is advantageous if the measurement light reflected back from the measurement spot is detected and measured under at least two different real observation directions.
  • the real illumination and observation directions of a target color measuring device of the same measuring geometry are used as the nominal illumination and observation directions for the correction of the measured reflection factors.
  • the colorimeter used can be matched with respect to the measurement results with the target colorimeter.
  • a color measuring device has a measuring arrangement comprising at least one illumination arrangement for exposing a measuring spot of a measuring object to illumination light in a respective real illumination direction and at least one picking arrangement for detecting the measuring light reflected back from the measuring spot under a real observation direction and for converting it into preferably spectral reflection factors and a computer-based control for the at least one illumination arrangement and the at least one pick-up arrangement and for the processing comprising the reflection factors generated by the at least one picking arrangement.
  • the color measuring device furthermore has means for correcting the measured reflection factors caused by deviations in the real illumination and observation directions of the color measuring device from measured value distortions caused by nominal measuring and observation directions given by the measuring geometry of the color measuring device.
  • the controller is designed to form from the measured reflection factors and the real illumination and observation directions of the colorimeter, a continuous correction model, which represents the relationship of the measured intensity of the measured light reflected back from the measuring spot with changes in the difference of the illumination and observation directions.
  • the controller is further configured to correct the measured reflection factors using this correction model, taking into account the nominal illumination and observation directions of the colorimeter.
  • control is designed for each pairwise combination of illumination and observation directions from the measured reflection factors a real brightness reflection factor representing the intensity and a nominal one from the real brightness reflection factors using the correction model and the nominal illumination and observation directions of the colorimeter Calculate brightness reflection factor.
  • the controller is also designed to correct the measured reflection factors on the basis of the real brightness reflection factors and the nominal brightness reflection factors.
  • the controller is designed to transform the real and the nominal illumination and observation directions of the colorimeter at flakenormalen angle and to calculate the correction model and the nominal brightness reflection factors in the space of the Flakenormalen angle.
  • the controller is further configured to calculate the nominal brightness reflection factors from the respective residual between the real brightness reflection factors and the correction model.
  • the controller is further configured to calculate the measured reflection factors based on the difference between the real brightness reflection factors and the nominal brightness reflection factors.
  • the color measuring device has at least three, preferably at least five illumination arrangements for illuminating the measuring spot under different real illumination directions.
  • the colorimeter further comprises at least two Aufpickan extracten for detecting the measuring light from different real Boebachtungsraumen.
  • Measurement arrangement is understood to mean the entirety of those components of the color measuring device which serve to illuminate a measuring spot on the surface of a measuring object and to detect the light reflected back from this measuring spot and to convert it into corresponding electrical signals.
  • Device standards is a device-fixed (imaginary) line to understand, which stands in the practical use of the colorimeter (ideally) perpendicular to the surface of the measurement object and defines the center of the measuring spot.
  • Real illumination direction is the direction in which the measurement spot is illuminated.
  • “real observation direction” is understood to mean the direction from which the measurement light reflected back from the measurement spot is picked.
  • nominal illumination directions and “nominal directions of observation” are understood to mean those illumination or observation directions for which the colorimeter is designed in accordance with its underlying measurement geometry. The actual real illumination and observation directions may e.g. due to manufacturing tolerances deviate (slightly) from the nominal illumination and observation directions.
  • spectrum direction is to be understood as the nominal observation direction mirrored on the surface of the (plane) measurement object. A multi-angle colorimeter has several real illumination directions (and possibly several real viewing directions as well).
  • Measurement level is understood to mean a plane passing through the device standard and all directions of illumination and the direction (s) of observation as well as the specular direction. All real and nominal angle specifications refer to directions lying within the measuring plane.
  • the color measuring device is largely similar to that in the documents mentioned above EP 2 703 789 A1 and EP 2 728 342 A1 disclosed devices. It comprises a housing which accommodates a measuring arrangement and an electronic control. At the front of the housing, a display device is provided. Furthermore, control elements are arranged on the upper side of the housing. On the side of the housing is a Interface (preferably USB) for connecting the device to an external computer. On the underside, the housing has a measuring opening through which illumination light can exit from the interior of the housing and, conversely, measuring light can enter from outside into the housing interior (cf. Fig. 1 of the EP 2 728 342 A1 ).
  • the measuring arrangement designated MA as a whole, comprises a sheet body 11 fixed in the housing, in which all the optical or photoelectric components of the measuring arrangement MA are arranged in the exemplary embodiment shown by four continuous chambers 12, 13, 14 and 15.
  • these components consist of three illumination arrangements 20, 30 and 40 and an Aufpickan extract 50 with a spectrometer 53 to which the measuring light via a lens 51 and a light guide 52 is supplied.
  • the spectrometer 53 itself is located outside the chamber 15.
  • the three illumination arrangements 20, 30 and 40 are each assigned a lens 21, 31 and 41, respectively.
  • the three illumination arrangements 20, 30 and 40 which typically each have a light source comprising at least one or more light-emitting diodes with different emission spectra, illuminate via the associated lenses 21, 31 and 41 a measurement spot MF on a measurement object MO with parallel bundles of rays.
  • the illumination arrangements 20, 30 and 40 are each aligned below a real illumination direction 2, 3 or 4, these real illumination directions ideally coinciding with the given by the underlying measurement geometry nominal illumination directions, in practice, however, due to manufacturing tolerances (usually very small but not negligible) deviation from the nominal illumination directions.
  • the Aufpickan himself is aligned under a real observation direction 5, which also ideally coincides with the given by the underlying measurement geometry nominal observation direction, in practice, however, due to manufacturing tolerances (usually very small but not negligible) deviation from the nominal observation direction.
  • the entire measuring arrangement MA is made such that the illumination directions and the observation direction are located in a common measuring plane, which also contains a device standard designated 0. Furthermore, the measurement level also contains a specular 1 direction, away from the as Reference direction conventionally the angular positions of the observation directions 2, 3 and 4 and the observation direction 5 are measured.
  • the exemplary embodiment illustrated has a measuring geometry in which the three nominal observation directions (not shown) extend at an angle of 15 °, 45 ° or 110 ° to the specular direction 1, the second nominal illumination direction coinciding with the device normal 0.
  • the (also not shown) nominal observation direction runs in the illustrated embodiment at an angle of 90 ° to the specular direction. 1
  • the lenses 21, 31, 41 and 51 may also be omitted in whole or in part. Similarly, the illumination with parallel light is not mandatory.
  • the measuring arrangement MA can also have fewer or more illumination arrangements as well as more than one pick-up arrangement, such as that in the document EP 2 728 342 A1 described colorimeter is the case.
  • the illumination and observation beam paths are rectilinear.
  • the lighting arrangements 20, 30 and 40 are controlled by a computer-based controller 100 ( Fig. 2 ).
  • the latter also controls the picking arrangement 50 or its spectrometer 53 and processes its measuring signals.
  • the controller 100 may display measurement results on the display device and receive operator commands from the operators. Furthermore, it can communicate with an external computer PC via the mentioned interface, in particular transmit measured data and accept commands and control data. Further details are related below Fig. 2 explained.
  • the colorimeter Before the colorimeter is ready for use, it is first calibrated in a manner known per se on the basis of dark measurements and measurements on a white tile (Weiss reference). The measurements on the white tile are carried out separately for each lighting arrangement and Aufpickan nie.
  • the measuring procedure is carried out in principle in such a way that a complete spectrum with a plurality of reference points (wavelength ranges of, for example, 10... 20 nm) is provided separately for each illumination channel (illumination arrangements 20, 30, 40) by means of the picking arrangement 50 Width) over the wavelength range of interest (mostly visible spectrum plus near UV).
  • the spectrometer 53 is activated by the controller 100 for a certain time window (set in readiness for measurement) and the light source of the respective lighting arrangement is activated or switched on within this time window for a certain period of time.
  • the time window corresponds to the integration time of the spectrometer.
  • the already mentioned computer-based control 100 comprises as the most important functional units a microcontroller 110, a hardware control stage 120, a spectrometer control stage 130, a program or firmware memory 140, a data memory 150, a USB interface 160, control elements 170 and a display arrangement 180 in which the microcontroller 110 coordinates and controls the whole and is also responsible for communication with an external computer PC connected via the USB interface 160.
  • the hardware control stage 120 controls the lighting arrangements 20, 30, 40, ie switches the light sources contained in these on or off.
  • the hardware control stage 120 also controls a drive 71 arranged in the color measuring device, with which a white tile 70, likewise provided in the color measuring device, can be introduced into the measuring beam path of the color measuring device or removed therefrom.
  • the spectrometer control stage 130 activates the spectrometer 53 and reads out the measurement data generated by it, processes it and converts it into digital measurement signals (spectral reflection factors).
  • the (non-volatile) program memory 140 contains the firmware or software required for control and data preparation. If the colorimeter is designed as a peripheral for a higher-level computer, the programs for the control and the data processing can alternatively or completely also run on the external computer.
  • the (non-volatile) data memory 150 essentially contains device-specific parameters, such as e.g. Integration times for the spectrometer and activation time durations for the individual lighting arrangements as well as further data required for the color measurement or correction method described below.
  • the present invention is not concerned with the fundamental measurement technology as such and the evaluation of the measurement results, but with the problem of falsification of the measurement results caused by alignment or angle errors, in particular of the illumination arrangements (compared to an ideal device with exactly nominally aligned illumination and observation directions). , In the following, it is pointed to or to the inventive elimination or compensation of such measurement distortions on the basis of Figures 3-6 discussed in more detail. It is assumed that the colorimeter is already dark and white calibrated.
  • P is an effect varnish layer in which a flake F is located. The orientation of the flake F or the flak normal is such that the light entering at the angle of incidence emerges speculatively in the direction of observation.
  • this transformation into the flake angle space is now used as a starting point for the correction of the measured value distortions caused by angular errors. It is assumed that the actual illumination directions of the illumination arrangements and the real observation direction of the pickup arrangement (or in the case of multiple pickup arrangements the real observation directions) of the colorimeter used are precisely known. These real illumination and observation directions of the concrete colorimeter may be e.g. be measured by the manufacturer, with the corresponding data are stored in the colorimeter. However, the real lighting and observation directions of the concrete color measuring device can also be measured and stored by the user by means of methods known per se.
  • a set of spectral reflection factors is measured with the colorimeter on the measurement object to be measured, ie one spectrum among all (pairwise) combinations of real ones Lighting and observation directions.
  • the values obtained are referred to as spectral raw data R i ( ⁇ ), where the index i stands for a specific pairwise combination of real illumination and observation directions.
  • the evaluation of the reflection factor can be carried out for each wavelength or for a subset of wavelengths. Alternatively, for a suitable representation of the entire reflection spectrum (eg the mean values over all wavelengths) for each specific combination i of real illumination and observation directions one each the intensity of the Measuring light representing real brightness reflection factor R ( ⁇ ri ).
  • the color measurement method according to the invention is based on the physically based assumption that the intensity of the light emanating from a particular illumination arrangement, measured by a pick-up arrangement, changes continuously with a change in the difference between the illumination and observation directions. Consequently, a continuous parametric model of the intensity profile over the illumination and observation directions is formed from all the real brightness reflection factors and the associated real illumination and observation directions by fitting.
  • This model is referred to below as a correction model or correction function.
  • the first coordinate of the correction function is given by the illumination and observation directions, and the second coordinate represents the intensities measured under these illumination and observation directions.
  • the correction function clearly assigns a (brightness) reflection factor to each combination of illumination direction and observation direction. Using the correction function and the residual between given points or real brightness reflection factors and the correction function, a nominal brightness reflection factor is then unambiguously assigned to each combination of nominal illumination direction and nominal observation direction within the definition range of the correction function.
  • the first coordinate that is, the argument of the correction function
  • the Flake angle space by the Flakenormalen angle defines ⁇ .
  • the aspecular angle can be used. The aspecular angle is defined in air and is calculated for a measurement geometry from the angular difference of the observation direction to the direction of the specular reflection of the illumination.
  • a corresponding real flank normal angle ⁇ ri is calculated.
  • the refractive index n 2 of the measurement object is included in this calculation and would therefore have to be known or measured.
  • the refractive index is about 1.5.
  • the real Flakenormalen angle ⁇ ri but also the manufacturer or before the actual color measurement can be determined and stored in the colorimeter.
  • Each measured (or calculated from the measurements) real brightness reflection factor R ( ⁇ ri ) is assigned to the corresponding calculated (or stored) real Flakenormalen angle ⁇ ri .
  • This assignment is in Fig. 4 shown graphically, wherein the unmarked crosses represent the individual real Flakenormalen angle and their associated brightness reflection factors.
  • the Fig. 4 represents the real brightness reflection factors in the flake angle space.
  • a correction function K ( ⁇ ) is determined from the real brightness reflection factors R ( ⁇ ri ) and the associated real flank normal angle ⁇ ri .
  • the determination or adaptation of the correction function takes place according to any compensation method known per se so that it agrees as well as possible with the support points given by the real brightness reflection factors.
  • the correction of the raw data is then carried out (in several steps).
  • a corresponding nominal flange normal angle ⁇ ni is calculated.
  • the refractive index n 2 of the measurement object enters again and would therefore be measured.
  • a value of 1.5 can also be assumed here with sufficient accuracy for practice. Under these conditions, the nominal Flakenormalen angle ⁇ ni could already be determined by the manufacturer and stored in the colorimeter.
  • a nominal brightness reflection factor R ( ⁇ ni ) is calculated from each real brightness reflection factor R ( ⁇ ri ).
  • the Fig. 5 illustrates this.
  • the expression [R ( ⁇ ri ) - K ( ⁇ ri )] represents the residual between the respective real brightness reflection factor R ( ⁇ ri ) and the correction model or the correction function K ( ⁇ ).
  • Fig. 6 the most important steps of the color measuring method according to the invention are again summarized in block schematic form.
  • the individual process steps are designated 210-280.
  • Method step 210 may, as explained above, also take place on the manufacturer side or outside the actual color measurement method carried out by the user.
  • the method step 230 can take place at any point before the method step 250.
  • method step 260 may occur at any point prior to method step 270.
  • the measured values and other data processing or calculating process steps 220-280 are carried out under the control of the computer-based controller 100 of the colorimeter according to the invention.
  • the programs required for this purpose are stored in the software or firmware memory 140 of the controller and are executed by the microcontroller 110.
  • the color measuring device according to the invention therefore essentially differs from known devices of this type in that it is designed or programmed to carry out the described steps of the method according to the invention.
  • the color measurement method according to the invention is based on a basic physical concept, namely the knowledge of the real illumination and observation directions the measuring channels of the measuring device and the correction of the (spectral) reflection measured values of the measurement channels based on the information of the real illumination and observation directions and the nominal illumination and observation directions given by the measurement geometry and on a uniform correction model for all measurement geometries, which correction model is based on the flake angles , This leads to a systematic and plausible measurement correction.
  • the measured data are corrected with regard to measured value distortions caused by angular errors in such a way that they practically coincide exactly with the measured data recorded by an ideal color measuring device (same measuring geometry), ie without any angular errors.
  • the thus corrected measurement data thus correspond to those measurement data which would have been measured if the real illumination and observation directions matched exactly.
  • the method according to the invention also permits a relative correction which matches the measured data to that of another real, angle-error-prone target color measuring device (same measuring geometry).
  • the nominal illumination and observation directions of the device according to the invention are replaced by the (slightly misaligned) real illumination and observation directions of the target colorimeter. This relative correction is e.g.
  • the measuring arrangement MA can also be designed vice versa with respect to lighting and observation arrangements. This means in the specific case that the illumination of the measurement object would only take place under at least one defined illumination direction and for the detection of the reflected measurement light by means of three (or more) pickup arrangements under three or more different observation directions. Of course, any combination of one or more lighting arrangements and one or more Aufpickan glovesen are possible.
  • the color measurement method according to the invention shows its strengths in particular in multi-angle measurements, where the measurement object is illuminated with a larger number of illumination arrangements under different illumination directions and the reflected measurement light is measured by two or more pickup arrangements under different observation directions.
  • the inventive use of the uniform correction method for all measurement geometries increases the number of effective measurement values for the correction model, which enables improved interpolation of the data and increases the accuracy.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectrometry And Color Measurement (AREA)
EP15162791.6A 2015-04-08 2015-04-08 Procédé de mesure de la couleur et colorimètre Active EP3078950B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15162791.6A EP3078950B1 (fr) 2015-04-08 2015-04-08 Procédé de mesure de la couleur et colorimètre
US15/094,779 US10260943B2 (en) 2015-04-08 2016-04-08 Colour measurement method and colour measurement device
US16/291,691 US10724901B2 (en) 2015-04-08 2019-03-04 Colour measurement method and colour measurement device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15162791.6A EP3078950B1 (fr) 2015-04-08 2015-04-08 Procédé de mesure de la couleur et colorimètre

Publications (2)

Publication Number Publication Date
EP3078950A1 true EP3078950A1 (fr) 2016-10-12
EP3078950B1 EP3078950B1 (fr) 2024-01-03

Family

ID=52998088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15162791.6A Active EP3078950B1 (fr) 2015-04-08 2015-04-08 Procédé de mesure de la couleur et colorimètre

Country Status (2)

Country Link
US (2) US10260943B2 (fr)
EP (1) EP3078950B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6848500B2 (ja) * 2017-02-14 2021-03-24 コニカミノルタ株式会社 測色装置の校正装置、測色装置の校正方法、及び、測色装置の校正システム
EP3631418A4 (fr) * 2017-05-24 2021-03-10 Swimc Llc Mesure d'intensité de couleur de composition de revêtement à angles multiples
JP7184048B2 (ja) * 2017-11-14 2022-12-06 新東工業株式会社 検査対象物の表面状態の評価方法、評価装置、評価装置の制御方法及び評価装置の制御プログラム

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711580A (en) * 1985-01-28 1987-12-08 Hunter Associates Laboratory, Inc. Modeling properties of flake finishes using directional resolution and statistical flake orientation distribution function
US6707553B1 (en) * 1999-08-10 2004-03-16 Minolta Co., Ltd. Color measuring apparatus
EP1914529A1 (fr) * 2006-10-17 2008-04-23 C.R.F. Societa Consortile per Azioni Dispositif et procédé d'analyse de la couleur apparente et de la gonio-réflectance d'un objet
US20110143017A1 (en) * 2009-12-11 2011-06-16 E. I. Du Pont De Nemours And Company Method for generating and applying instrument profiles
EP2703789A1 (fr) 2012-09-04 2014-03-05 X-Rite Europe GmbH Colorimètre manuel
EP2728342A1 (fr) 2012-11-06 2014-05-07 X-Rite Europe GmbH Appareil de mesure portatif destiné à saisir l'aspect visuel d'un objet de mesure

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6166814A (en) * 1997-09-30 2000-12-26 Georgia Tech Research Corp. Method and apparatus for color matching paints
JP3941569B2 (ja) * 2002-04-12 2007-07-04 トヨタ自動車株式会社 反射率推定方法
JP2006010508A (ja) * 2004-06-25 2006-01-12 Konica Minolta Sensing Inc マルチアングル測色計

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711580A (en) * 1985-01-28 1987-12-08 Hunter Associates Laboratory, Inc. Modeling properties of flake finishes using directional resolution and statistical flake orientation distribution function
US6707553B1 (en) * 1999-08-10 2004-03-16 Minolta Co., Ltd. Color measuring apparatus
EP1914529A1 (fr) * 2006-10-17 2008-04-23 C.R.F. Societa Consortile per Azioni Dispositif et procédé d'analyse de la couleur apparente et de la gonio-réflectance d'un objet
US20110143017A1 (en) * 2009-12-11 2011-06-16 E. I. Du Pont De Nemours And Company Method for generating and applying instrument profiles
EP2703789A1 (fr) 2012-09-04 2014-03-05 X-Rite Europe GmbH Colorimètre manuel
EP2728342A1 (fr) 2012-11-06 2014-05-07 X-Rite Europe GmbH Appareil de mesure portatif destiné à saisir l'aspect visuel d'un objet de mesure

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ERIC KIRCHNER; WERNER CRAMCR: "Making sense of measurement geometries for multi-angle spectrophotometers", COLOR RESEARCH & APPLICATION, vol. 37.3, 2012, pages 186 - 198
WILHELM H. KETTLER, FARBE UND LACK // SEMINARE MODUL 2: TIEFERE EINBLICKE IN DIE FARBMETRIK, vol. 25.-27, June 2014 (2014-06-01)
WILHELM H. KETTLER: "Geräteprofilienmg: Management globaler Farbkonsistenz", DFO TAGUNG QUALITÄTSSICHERUNG UND PRÜFVERFAHREN, 2008

Also Published As

Publication number Publication date
US20160327431A1 (en) 2016-11-10
US20190265102A1 (en) 2019-08-29
US10260943B2 (en) 2019-04-16
EP3078950B1 (fr) 2024-01-03
US10724901B2 (en) 2020-07-28

Similar Documents

Publication Publication Date Title
EP2930494B1 (fr) Appareil de mesure portatif destiné à saisir l'aspect visuel d'un objet de mesure
EP0878704B1 (fr) Dispositif de mesure de réflexion
EP2270451B1 (fr) Appareil de mesure de couleur
DE4434168B4 (de) Vorrichtung und Verfahren zur Messung und Auswertung von spektralen Strahlungen und insbesondere zur Messung und Auswertung von Farbeigenschaften
EP1775565B1 (fr) Procédé de mesure de couleur d'échantillons imprimés comprenant des azurants optiques
DE102007053574B4 (de) Farbmessgerät
DE19636774C2 (de) Verfahren zur Anpassung einer Farbrezeptur
AT400768B (de) Tragbares spektralphotometer
EP2409125B1 (fr) Procédé et dispositif pour effectuer une comparaison optique entre au moins deux modèles, de préférence par comparaison d'extraits sélectionnables
EP3564654B1 (fr) Dispositif et procédé d'examen de revêtements à l'aide de pigments à effet
DE102014103640A1 (de) Vorrichtung und Verfahren zum Untersuchen von Oberflächeneigenschaften
EP3078950B1 (fr) Procédé de mesure de la couleur et colorimètre
DE102008010562B4 (de) Verfahren zum Instrumenten-Abgleich von Mehrwinkel-Farbmessgeräten
EP2703789A1 (fr) Colorimètre manuel
EP2975370B1 (fr) Colorimètre
EP3928079B1 (fr) Procédé et dispositif d'identification de pigments d'interférence dans un revêtement
DE10246563A1 (de) Vorrichtung und Verfahren zur Bestimmung der Farbe/n auf einer Oberfläche
EP1650589B1 (fr) Microscope avec dispositif de réconnaissance de composants optiques
DE102019208114B4 (de) Vorrichtung und Verfahren zur 3D Vermessung von Objektkoordinaten
EP1602903A2 (fr) Méthode et dispositif de mesure colorimétrique de laques à effets et unilaques
DE3244286A1 (de) Elektro-optische vorrichtung zum erkennen von farben
EP2199765A1 (fr) Procédé et appareil de mesure de couleur manuelle destinés à la mesure d'une échelle de mesure de couleur
DE102020107457A1 (de) Messvorrichtung zur Vermessung von optischen Strahlungsquellen und Verfahren zur Durchführung einer Vermessung
WO2024088687A1 (fr) Appareil et procédé de mesure de propriétés optiques, en particulier d'un dispositif de mesure de couleur
AT522840B1 (de) Verfahren zur Kompensation in einem Messsystem

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170320

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20190920

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20230728

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502015016714

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240103

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20240103